package rabbitmq.simple;

import com.rabbitmq.client.*;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class ConsumerDemo {
    public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
        // 1.创建连接
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.100.10");
        connectionFactory.setPort(5672);
        connectionFactory.setUsername("study");
        connectionFactory.setPassword("study");
        connectionFactory.setVirtualHost("bite");
        Connection connection = connectionFactory.newConnection();

        // 2. 创建 channel
        Channel channel = connection.createChannel();

        // 3. 声明队列
        channel.queueDeclare("hello", true, false, false, null);

        // 4. 消费消息 (若是生产者已经声明, 那么可以省略, 要是消费者启动的时候没有队列则会报错)
        /**
         * basicConsume(String queue, boolean autoAck, Consumer callback)
         * queue : 队列名称
         * autoAck : 是否自动确认
         * callback : 接收到消息后, 执行的逻辑
         */
        DefaultConsumer consumer = new DefaultConsumer(channel) {
            // 从队列中受到消息, 就会执行的方法
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                // 这里要是有消息没有接收到, 说明资源可能先一步被释放了
                System.out.println("接收到的消息: " + new String(body));
            }
        };
        channel.basicConsume("hello", true, consumer);
        // 等待程序执行完成
        Thread.sleep(2000);

        // 5. 释放资源
        channel.close();
        connection.close();
    }
}
